Search Google Appliance

This is an example of an early handheld electronic calculator marketed by Texas Instruments under its own name. The calculator has a tan plastic case with a dark brown keyboard. It has an array of nineteen keys, seventeen of them square and two rectangular. These include ten digit keys, a decimal point key, a total key, four arithmetic function keys, a clear key, a clear entry key, and a percentage key. The percentage key distinguishes it from the TI-2500B.

A mark above keyboard on the right reads: Datamath II. Behind the keyboard is an eight-digit LED display.

A jack for a power adapter is along the back edge. An on/off switch is on the left side.

The back of the calculator has a compartment for storing either two rechargeable nickel-cadmium batteries or two AA-sized non-rechargeable batteries.

A sticker on the compartment cover reads: TI-2500II electronic calculator (/) Texas Instruments Incorporated (/) P.O. Box 22288: Dallas, Texas 75222. It also reads in part: Serial Number (/) 2500II- 019756. The sticker indicates that the calculator should be recharged for twelve hours using an AC9130 adapter/charger.

Unscrewing three long screws on the back of the case does not reveal the chips.

This modification of the TI-2500 was introduced in 1974 and sold at least until 1975.

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.